<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
       ul{
        list-style: none;
        padding-left: 0;
       }
       li::after{
        content: '@';
        color: aquamarine;
       }
    </style>
</head>
<body>
    <ul>
        <li>项目1</li>
        <li>项目2</li>
        <li>项目3</li>
    </ul>
</body>
</html>